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  1. #1

    Default driveabilty problems with an 05 silvy 5.3

    when idrive awhile and go to stop sometimes it doesn't want to idle well. to me the truck idles too low anyways. At opperating tempreture (205 to 210 degrees) it only idles @ 500 rpm and if it idles for more than a couple of minutes it starts to stumble a bit. I know the stumbling and occasional stalling is because it's idleing too low , but how do I fix it??????/

  2. #2
    Sr. Apprentice
    Join Date
    Nov 2009
    San Marcos


    Clean out the throttle body,(remove the intake). There will be some black residue that you can clean off with a rag and dw40. You will see how it does not allow the plate to close all the way.
    2001 2500HD 4x4 8.1L/ally,CCSB,diablo with diablew tuned and too much to list....

  3. #3


    i have a 99 5.3 and it idles at 500 just fine, maybe u have a vacuum leak or something else is the problem.

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